Sélection de paramètres physiques pour la régulation et la maîtrise de la distribution de nourriture (Skeletonema costatum) aux coquillages d'intérêt commercial

A study was realized to automate the distribution of phytoplankton (Skeletonema costatum) in the extensive breedings of shells of commercial interest. Physical parameters were selected to define their domain of application for the realization of such a project The work was realized in spring (in June, 1999) and in autumn (in November, 1999) in different dilution of phytoplankton in a treated subterranean salt water. The results showed that the fluorescence gave a better sensibility to inter seasonal in the explanation of the distributed food, but lost as representation during the night-phases, On the other hand, the absorption ( optical density) presented less daily variability and with good correlations with the nourishing concentration of the environment (coefficients of determination >0.7). However, thewavelength chosen as this study (660 nm) is too specific sorne chlorophyll, it should be fixed below this value to take into account a wider range of better explanatory pigments of the biomass in algae,